86821039 has 2 divisors, whose sum is σ = 86821040. Its totient is φ = 86821038.

The previous prime is 86821027. The next prime is 86821043. The reversal of 86821039 is 93012868.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86821039 - 2¹⁹ = 86296751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86820989 and 86821007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86821019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43410519 + 43410520.

It is an arithmetic number, because the mean of its divisors is an integer number (43410520).

Almost surely, 2^86821039 is an apocalyptic number.

86821039 is a deficient number, since it is larger than the sum of its proper divisors (1).

86821039 is an equidigital number, since it uses as much as digits as its factorization.

86821039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 86821039 is about 9317.7807980227. The cubic root of 86821039 is about 442.8007280449.

The spelling of 86821039 in words is "eighty-six million, eight hundred twenty-one thousand, thirty-nine".